Instructions

1. Adjust an oven rack to the lower third position and preheat the oven to 400 degrees. Butter or coat with cooking spray a 15 1/2 x 10 1/2 x 1-inch jelly-roll pan.
2. To measure flour for this recipe, dip dry measuring cups into the flour container, fill to overflowing, and level with a metal spatula. Better yet, weigh the flour.
3. For the almonds, put the nuts into the work bowl of a food processor fitted with the metal blade and process about 30 seconds or until the nuts are finely ground. Don’t over-process of the nuts will turn pasty. Set aside.
4. For the crust, cut the cold butter into tablespoon-size pieces. Put the metal blade in the work bowl of a food processor and add the flour, butter, salt, sugar, and zest. Process about 10 seconds until the dry ingredients are the texture of coarse meal. Put the egg yolks into a 1-cup glass measure with pouring spout and combine them with a fork. Add ice water to bring the volume to the 1/2-cup line and mix with the fork. Start the food processor and add the liquid through the feed tube in a steady stream, taking about 10 seconds. Stop the machine. Scrape the work bowl, and continue processing until the dough gathers into 2 or more large lumps, about 20 seconds. Dump the dough onto your work surface and press the lumps together. (Dough may be used immediately or wrapped in plastic wrap and refrigerated for up to 2 days).
5. Roll the dough on a lightly floured surface into a rectangle measuring about 19- x 14-inches. Don’t be concerned about rough edges; they’ll be trimmed away later. Set your rolling pin on a short end of the dough and carefully roll the dough around the rolling pin. Unroll the pastry so that it rests on the rim of the jelly-roll pan, covering the pan completely. Fit the dough loosely in the prepared pan, making sure it reaches snugly into all corners without stretching. Trim off excess dough with a small sharp knife. (Use scraps to make cookies, if you wish).
6. For the filling, sprinkle the almonds evenly over the bottom of the crust. In a small bowl, whip the whites until they hold stiff peaks but look moist. Put the huckleberries into a medium bowl. Add the beaten whites and fold them with the huckleberries using a large rubber spatula. Spread the berries evenly over the almonds. There will be a thin layer of fruit, about the depth of 1 huckleberry.
7. For the streusel, put the flour, sugar, and salt into the work bowl of a food processor fitted with the metal blade. Cut the cold butter into tablespoon-size pieces and add them to the work bowl. Process 20 to 30 seconds until the streusel is the consistency of fine crumbs. Spread evenly over the huckleberries without packing down.
8. Bake for 35 to 40 minutes until the edges of the crust are well browned and the topping is golden. Cool completely on a wire rack before cutting into bars.
9. Makes about 40 bars or 20 larger servings.